Emergency valve device



Octwll, 1938. B; s.' ,MKMANA EMERGENCY VALVE DEVICE Filed May 26. 1936 lNvEN'roR BURTON '5. AIKMAN BY W ATTORNEY `Patented YOct. 1, QS

VUNITED lSTATES PATENT lFFICl e VEivnmGENcY VALVE lDnvlci'i Burton S. Aikman,"k Wilkinsburg', Pa., assignfor to The Westinghouse Air Brake Company, Wilmerding, Pa., a"corporationy of Pennsylvania Application May 26,. 1936, SPIal'iNO.- 81,863 aznclairmvs. (dp303- 42) This invention relates to a fluid pressure brake equipment and more particularly to an improved brake controlling valve device.

In some types of brake systems heretofore developed there have been provided emergency valve. devices subject to the opposingpressures of -the fluid in the brake pipe and'of the fluid in a pressure chamber forventing fluid under pressure from the brake pipe and for supplying fluid V.under pressure tothe brake cylinder on a reduction* inthe pressure of the fluid in the brake pipe atan emergency rate. -fl These emergencyvalve devices have incorporated means for releasing uid under'pressure fromthe pressure chamber during a reduction'in i the pressure of the uid in the brakepipe-at a service rate in order to prevent the development of suicient difference inthe pressure of theiiuid lin the brake pipe and in the pressure chamber to cause the emergency valve device to move to the application position. g

It for any reason the operating` elements .of

the emergency valve deviceshould oifer a high frictional resistance to movement, on a reduction in the pressure of the fluid in the brake pipe at a service rate the valve device may not moveto the position to release uid under pressure `from the pressure chamber, and because of the continuing-reduction in the pressure of the -fluid in the brake pipe the pressure diierential Vbe` tween the pressure chamber and the brake pipe will increase and will eventually overcome the resistance to movement of the valve device. The pressure diierential between the brake pipe and 3.5 the pressure chamber may then beso great as to cause the valve device to move to the application position, thereby producing an undesired emergency application of the brakes.` Y

It is an object of the present invention to proip) vide an improved emergency valve device. A further object of the inventionY is to provide an 'emergency valve device which employs a dia-V phragm in place of the piston in the valve devices now in use. e 45 Another object of the invention is to provide an emergency valve device which employs poppet typevalves instead of the slide valves which are employed in the' valve devices now in use.

A further object of the invention is to provide 50 an emergency Valve device in which the sliding and friction areas in the device are reduced toga minimum, whereby the valve device Vis very sen# sitive to variations in the pressures to which it is intended to respond. j 55 Another object of theinvention isto provide which is employed an emergency valvedevice responsive to differences in theV pressure of the fluid in the brake pipe and in a pressure chamber and which is so constructed that it `will always operate in response to substantially the same pressure differences. 5

IA furtherobject of the invention is to provide anA emergency valvedevice whichwill require a minimum. of attention to keep it in proper working condition. f

*Another object of l the-invention is toprovide 10 anemergency fvalve device which is constructed and'varranged Asof'that it may be employed in place ofwthe valve devicesnow in use and vwhich operates inthesame manner as the' valve device which'it replaces. y 15 Otherobjects of the invention and features of novelty will be apparent from theA followingde- V scriptiontak'en in connection with the accompanyingy drawing, in which Fig. 1 is a fragmentary'view, largely in section, 20 of a Ybrake'equipment incorporating an emer-V gencyvalvedevice embodying this invention, and

gFig. 2 is asectional'view taken substantially along the line 2 2-of Fig. 1. r lieferring to the drawing, the brake equipment 25 therein -illustrated comprises a brake pipe I, a brake cylinder?, an auxiliary reservoir 3, an emergency reservoir- 4, ,and a brake controlling valve'device indicated generally by the reference numeral 5. j

The brake controlling valve device 5 comprises apipe bracket section 1 having a mounting face formed-thereon against which is secured the emergency valve device I Il provided by this invention.` The pipe bracket sectionk hasA formed 30 thereon another" mounting face, not shown, against which is secured the service portion of thebrake controlling y-valve device, this portion not4 beings shown in theT drawing. .Y g The pipefbracket section 1 and the service portion, vnot shown, ofthe brake controlling valve device 5`are identical in `construction and operation with theffcorresponding parts of the brake controllingvalve device shown in U. S. Patent No. 45 2,031,213, issued February 18, `1936, to Clyde C. Farmer, while theemergency valve device I0 provided by'this invention'is intended to operate in place of the emergency portion employed in the vbrake controlling valve device shown in the above V which is'clampedbetween the body of the emer' 55V gency valve device I8 and the pipe bracket section'I.

The central portion of the diaphragm I2 is secured between the flanges I6 and I8 on a stem One end of the stem 28 is slidably supportedV pressure of the fluid in a chamber 26 which communicates by way of a passage 28 in the pipe bracket section I and the branch pipe 38 with the brake pipe I. 'I

The diaphragm I2 is subject on the other side to the pressureV of the fluid in the chamber 32 which is in constant communication with the area on the face of the diaphragm I2 by way of passages 341through the guide member 22. 'I'he chamber32 is also in constant communication by way of a passage 38 with abquick action chamber 38 formed in the pipe bracket section I. Y

'The stem 28 has a'chamber .48 formed therein and one Vend' ofthis chamber is closed by means lof a threaded p1ug42 through which Yextends va restricted passage 44 ,whichcommunicates with the chambers" 28 and 48. f

''hevalvekdeyicej24 includes a poppet valve 48 carriedby a stem 48y which is mounted in a bore in the stern 28, the .valve 48 being positionedin the vchamber 48 and being adapted to seat on a seat formed on the` stem 28so as to control com--V munication Ybetween the chamber 4|)Y chamber 32 through k.passages 58. i' The stem 28 has a chamber.52 formed therein and the `which is in constant.communication'by,way Vof passages 54 withfthe chamber 32.' g

`A .spring 58 is positioned in the chamber 52 and extends between the valve device 24 and a Vshoulder on the stem,28 and yieldingly urges the valve device 24 in a direction tov move the poppet @valve 4S `to the seated position.

Y The `emergency valve device .I8 has associated therewitha double Vseating poppet valve device indicated generallybythe reference'numeral 88 and controlling communication between a cham- Y ber 82 on the face 'of the'valve device 2,4 and a chamber 64.v The chamber B2 is in constant communication by way of a passage 66 kwith the seat upon a seat surrounding the bore in whichV the stem is mounted-and having atthe other end a poppet valve Z-vvhich is adapted to Vseat Vupon a seat surrounding this end of the Ybore in which the stem vof the'valve device ismounted. y

*TheY double seating poppet valve device- 68 has associated therewith a spring 'I4 which yieldingly urges it to the right` as viewed in Fig. 1 of the drawing,y so as to /cause thevalve 18 to engage its seat. The spring'll andthe spring 56 are proportioned Vso that the spring 'I4 is substantially weaker than the spring 56.

AThe valve '5280i thepoppet valve device 68 is adapted to beY engaged by the'valvedevice 24 so that on movement of thevalve devicel 24 to the left, as. viewed in Fig.` -1 of the drawing, the

poppet valve k,device 8|) is. moved'v against theysure of the uid in the brake cylinder spring 14 until the valve l2 ismoved into engagement with its seat.

Vway of a passage'84 with a valve chamber 86 in which is mounted a poppet valve 88 which is urged to the seated position by means of a coil spring 88. The area on the opposite'side of the piston 88 is open to the atmosphere by way of a passage 92, while the body of the emergency valve device I8 has a groove 94 formed therein which in onepositionof the piston 88 extends around the piston so as to'establish communication between the chamber 82 and the atmospheric passage 92. I

lThe piston 88 has a restricted passage 96 eX- tending therethrough, while the body of the emergency valve device I8 has an annular .gasket 98 associated therewith and carrying a seat rib |88 which is adapted to be engaged by a face of the piston 88 to prevent'the escape of fluid under pressure from the chamber 82 around the periphery of the piston in one position of the-piston.

The piston 88has a stem I 84.1 formed integral therewith', while a vent valve |86 is secured on the stem |84. .The vent va1Ve`|86 is mounted in a chamber |88 and carries a sealing gasket ||8 which is adapted to engage a seat'V rib ||2.r A.The vent valve |86 is urged to the seated position by means of a coil spring I I4. Y

yThe chamber |88 in which the vent valve |86 is mounted is constantly connected by way of a passage I I8 with a chamber |28, and this chamber is constantly connected by way of a passage' |22 with the passage 28 to which is connected the branch pipe A38 leading to the brake V`pipe I. The chamber |88, therefore, is constantly yconnected to the brake pipe I and-to the chamber 26 on the face of the diaphragm t2. n

The body of the emergency valve device I 8 has a chamber |24 formed therein in which is mounted a spill-over check valve- |28 which is urged by means of a spring |28 into engagement with a seat rib |38. The chamber |32 within the seat rib |38 contains a ball check valve |34 which is adapted to seat upon a seat surrounding a v passage which communicates with the passage 36 and thereby with the chamber 32 and the quick action chamber 38. The chamber `|24 is constantly connected by way of a passage and Ypipe |36 with the emergency reservoir 4.

v The emergency Valve device providedby this Vinvention rhas associated therewithan inshot valve Vdevice indicated generally by the reference numeral |48 which operates onanV emergency application of the brakesto'reduce the rate of flow of uid to the brake cylinderafter the preshas increased to a predetermined value. f Y- As shownin the drawing,vthe inshot valve device I48 comprises a valve|42 which .is4 mounted in a chamber |44 and which is urged towards a. seat( rib |48 by means of a coil spring |48 so as to` control'- communication between the chamber |44 and a chamber |58 by way of a passage '|52 of relatively large ow capacity.

A passage |54 of restricted ilow capacity is provided 'between the chamber. |44 andthe chamber main slide valve of the service portionfo the valve device (not shown). Y i l The body of the emergency valve device has a bore therein in which is mounted a piston' |58 v with the area outwardly of the seatrrib |66 ,on

' Athrough the valveV |42 andthe stem |V10.-f f l v f .The body of the emergency valve devicel has having -secured on a face thereof a sealing gasket |68 which is adapted to seatV upon a seat rib |62 surrounding a chamber |64 kwhich isin constant communication with the chamber |50.`=

The other'face-of the inshot lvalve piston |58 has an annular seat-rib |66 formed thereon which' is adapted to `engage a sealinggasket |68`asso ciated with the body ofthe valve device.

The chambers |64 and |50 are in constant com` munication with the brake cylinder ,2 by Way of apassage and pipe |69; i

'Ihe inshotvalve piston` |58 hassecuredthereto a stem |10and the valve '|42 is carried bythis stem; L a 21.11;, The chamber |12 Within the seat rib |66'on the face of the inshot valve piston |58 is Aconstantly connected by way of apassage |14 with an inshot piston volume |16 and'with a'valve chamberlla.

A spring is mountedinthe chamber |12- and yieldingly urges the `inshotvali'le piston |578 to the right, as viewed in Fig.- 1 of the drawing,

so that theV sealing gasket |60 engages Ythei-seat Y rib |62. The spring |80Yand'the spr-ing; |48 are proportioned vso that the spring |861' exerts asub'-, stantially greater force on the-inshot valve piston" |58 than does the spring |48; which Yoperates a groove |82 cut therein Whichrcommunicates the piston |58k and the area on the opposite side of the piston outwardly of the seat rib 162.'.

The .emergency valve device |0 lincludes valve: means for controlling the supply of iluid under pressure from thebrake cylinder'2 to the chain-f` ber |12 on the face of the inshot valve piston |58 in order to regulate the operation ofthe inshot valvedevice. x A This valve means {comprises apoppet-valve. |84 mounted in thechamber |18 and having a utedstem which is positioned in a passage extendingA from the chamber |18 to akchamberv|86 whichis in constant communication with vthe brake cylinder 2 by way of a passage |88 and the pas,-v sage 56 leadingto the chamber; |44 Aof theinshot valve mechanisml The valve |84 is'yieldingly urged to the seated position by 'means `of `aV spring.

|85. Y The emergency valve device .provided` byy this invention includes a timing valve. device which operates during an emergency application of the brakes to increase the rate off'ow ofV fluid under pressure tothe brakeY cylinder after .qa time intervalI f As shown in the drawing rthe timingvvalve vice, which, is indicated generally by the reference numeral i |90, comprises a movable abut,.

ment in the form of a diaphragm |92, which is subject on one .side to the pressureo'f the uid in a chamber |94, which is in constant communi,-V cation by Way of a passage |96 with thechamber 32.

The diaphragm |92 has mounted on the other face thereof `a sealing gasket, |98 Whichis. adapted The area within the to engage a seat rib 200. seat rib 200 is connected byk Way offa `passage 202 with the passagev |88, l`and therebyntothe passage |56-.which`| communicates with a port in,the'-s'ezattfof` the main slide valvev of the service portio'nuzifv the 'brake controlling valve device.

v Thea'reaputwardly ofthe seat rib 200 communicateswith .the brake cylinder 2 by wayof a chfcike2|l4i and the passage and pipe |69.

i-,When the' valve |84 is in the open position the brake cylinder 2 is connected to the inshot piston 4volume |16=and alcommunication in the form of to the brakecylinderthrough this passage;

Asshown in the drawing` the accelerated re.- lease check valve' comprises a valve 2 |0 which is mounted in the Vchamber 20 and isV urged by means4 of Ya spring 2| 2 intol engagement with a seat rib 2 |4 :surrounding a chamber 2|6 in which adaptedto seat upon" a seat which surrounds the endfof'the=pass`agev 208. A'

The-,valve ydevice-'provided"by*this invention includesiaeipppet valve to control the supply of uidjunderfpressurevfrcmfthe emergency reservoir 4to thebr'akecyflinder 2; 4As'shown in the drawingthere isa vpoppet valve 220 which is mounted ina chamber 222 and "which controls communication between vthe chamber 222' and the cham-Y ber |86;l The valve 220 is urged to the seated .position by means of `a spring 224, while the chamber'2'22 is Iconstanlily-'connected by `way' of a passagev226 with the passage |36 and thereby withthe emergency reservoir 4.

` This emergency'valve device includes means operatedby the diaphragm |2 for controlling they valves 88, |84 'and 22|).` This meansV comprises a shaft l230 which is vjournaled in a bore which extends through a wall 232 which separates the chamber 32 and the chamber |86. The shaft 230 is Varrangedl to closely t the bore in which it is mounted and the portion of the wall 232 through Whi-ch'this .bore extends is-preferably relatively thick so 'as to provide a long bearing surface for the shaft 230 and thereby reduce to a minimum the flow of-fluid lThe endof the shaft 230 which projects into theY chamber 32 has mounted thereon a rocker arm indicated generally by the reference numeral 234. The rocker arm 234 has a hub portionhaving a-,bore therein 'which is closed at its inner v shaft`236by means of `a key 236 which prevents relative rotative movement between the rocker Yarm 2|4fandthe shaft 230, but permits movement 'of these members relative to each other axiallyof` the shaft 230. v p

" A sealing gasket 238 is mounted on the shaft 23|! 'between the rocker arm 234 and the wall 232, While the rocker armf234 isurged by means of a spring-240 against the sealing gasket 238 so as to compress this gasket between the rocker arm 234 and the wall 232'. f f

Therocker arm 234 hasl formed integral therewith an arm 242 which is adapted to engage the end ofthe stem of. the valve 88V to move this valveagainstthespring associated therewith. The rocker arm 234 also has formed integral n therewith vspaced arms 244 having rounded end `portions-which ,extend into an annular wgroove formed on the stem 20. On movement of the stem `2|) in .onedirection` the .arms 244 are en.

between the chambers 32 and formed on thefstem 20.

tionsrcf thev armsv 244 Yare preferably proporgagedfbya shoulder 246 on the stem 20, and on movement of the stem in the other direction the rarms 244 are engaged by a shoulder 248 The rounded end por- Vstem associated with the valve 220, as is best shown in Fig. lof the drawing. f Y

The rocker; arm 25 has a hub portion having a' boreA therein which is closedat the inner end and into which the end of the shaft 230 extends.

A key 256 is provided and secures the rocker arm 250 on the shaft 236 so as toV prevent relative rota# tive V'movement therebetween, but to permit movement of the rocker `armf25|l axially .of the shaft V230.1 A sealinggasket 258 is Ymounted on Ytheshaft'23V between the rocker arm'250 and the meansof afspring 250 to the right, as viewed in Fig.; 2`-of,the'drawing,fso as to compress the gasket 258between the'rocker arm 252|) and the Wall 232 and thereby prevent the now of' uid between the chamber |86 andthe bore in which the shaft 23|)Y is mounted. l

yThe various partsof the emergency'valve device provided by this invention are arranged and proportioned sok that-when the diaphragm I2 is inthe normal release positiomwhich is the positionin which it is sho-wn in Fig. 1V ci the drawing, the valve' 48, which controls the flow of fluid 'from the brake pipe I to the chamber 32, is seated, andl so that the poppet valve device lili,` which controls' the release of fluid underl pressureV from the chamber 32 to the atmosphere., is inthe positionin which the valve 'I2 engages its seat tccut off the release of fluid from the chamber 32; 'f

In this position of the diaphragm I2, the valve |54 is'held away from 'its seat by kthe arm 252 of the rocker arm 250, thereby establishing 'com-- munication between the chamber |86 and the chamberV |18.

Atfthis time the end zei rof the arm 252 is out of engagement with'the valve 226, beingv spaced held in the seatedppositio'n by the spring 224.

Y In, this position-of the diaphragm |2^therocker Y arm 2734*-is ina position in which the arm 242 thereof is vspaced from the end ofthestem of theY 'valve 88 a short distancefand'the valve 88, which controls'the supply of fluid under pres-U sure from thefchamber'Zto the chamber 82r on the face of theV vent 'valve piston 88, is held in the seated position by means of the spring 98.

When the'brake pipe I and the chamber 32 Vare at atmospheric pressure the diaphragm Yi2 is held bythe springri85 operating ythrough the valve Y |84 and theiarm 252 of the rocker'arm 250 in a position ashortdistance to the right as viewed i in Fig. lof theV drawing, fromthe position in 'i which itis shown in the drawing, and the valve Wall232 and kthe rockerarm' 250 is urged byr presses'against the en'd efV the valve S8 and holds this Valve away from its seat against the spring- '90. The spring |85 associated with the valve |84 lout of engagement withV its seat and in which the valve l0 is in engagement with its seatv or is positioned adjacent thereto,

In initially charging theequipment fluid under pressure is supplied to Vthe brake pipe I, and it `vflows therefrom by way of the branch pipe-30 and the'passage 28 in the pipe bracket section 'I to the chamber 26 on the face of the diaphragm I2 and'in'creases thefpressure of t le fluid in this chamber.- Fluid under pressure supplied to the ,the normal release position,V and on this moveient of the stem 20 the rocker arm 234 is operated'to move theV arm 242 away/from the end of` the stem of the valve 8S and permit this valve to be moved to fthe seated position by the spring 98, while the arm 252 ofthe rocker arm. 258 is moved against the end rof the stem Vof Ythe valve |84 and moves this valve away from its seat against the spring |85. Y

In addition, on this movement of the diaphragm I2 and the stem 2|),the valve device 24 is moved against the poppetvalve device and moves this valve device against the spring 14 so that fthe valve i2 is' mcved'to the seated posi@ f 56 -is Vcompressed somewhat, and this force tra'ns'mitte'dfthrough the Vvalve Vdevice 24, which presses against the valve 'I2 of the pop-pet valve deviceV 60, sor as' tomore 'rmly pressV the valve 'I2 against its seat. 'i On this lmovement of the stern 20 the' seat'carried by the 'stem 20 moves away fromV the valve 48,'therebywopening communication between Vthe chamber r40 and the chamber 32 through the passages V5B, and iiuid under pressure supplied to thefchamber 4|] from the chamber`26' iiowsrtherefrornthrough the pas'- sages5|lrto the chamber 32,'and from the chamber 32 fluid under pressure iiows by '-.vay of the passage 36 to thequick action'chamber 38. YThe ratefo-f increasein the pressure ofthe uid in thechamber 32a'nd the quick action chamber 38 vis relatively slow, however, because of the restrictedrate-atV which fluid under pressure may flow'from the Achamber 26 through the restricted passage '44., Y Y' In'addition, on this movement of the stem 2li Y the rockerarm 234listurned/so'as move the arm 242 away fromthe end' of the stem of the valve 88, while this movement `of the rocker arm 234-is transmittedthrough the shaft 230 to turn the rocker arm 250 sorthat .the rspherical-end p ortion 254 on the arm 252 presses against the end ofV the `-stem of the valve I84wand moves this valve against the lspring |85 fartherawayv from its seat. By this movement of the -rocker'arm 250`th`e spherical end portion 254'is'moved farther away from the valve 220. A

On an increase in the pressure of the `iiuid in the chamber 32 uid under pressure flows therefromfthrough the'ports 34 in the guide member 22 to the area'on' the face of the diaphragm I2.` Fluid'under pressure 'suppliedft'o the chamber? 32 also flows therefrom through the ports'l54 Vto the chamber 52 within the stem 29, aridi-from thisY chamber itfiows through' the ports 66 'to the chamber 62 on the face of the valve device 24. As the valve 'I2 of the poppet valve device 60 is in the seated position at this timefthe release of fluid under pressure from the chamber 32 is cut off; Fluid under pressure supplied to the chamber B2 ows therefrom by `way of the passage |96 to the chamber |94 Von the face of.V

the diaphragm |92 of the timing valve vdevice |90 and exerts a force on thisdiaphragm vto hold the sealing gasketl |98 in engagementwith the seat rib200. 1 l Y After a time interval the pressure of the fluid in the chamber 32 will increase' substantially to th'epressur'e oi" the fluid .in the chamber 26 on the oppositeY face of the diaphragm I2, andy when 56 will have expanded suiiiciently to move the` stem 2U to the right so that the seat* carried thereby will engage the'valve 48 to cut oflV zoommunicationl between the chamber 46 and the chamber 32 through the passages 50, thereby cutting ofi theV Ysupply of uid under pressure to the chamber 32 from thev chamber 40 and .chamber 26, and cutting off the further increase in the pressure of the uidin the chamber 32.

On the return of the stem 29 from the inner release position to thek normal release position the valve I84wi1l be moved by the spring |85y towards its seat substantially to the position in which itis shown in Fig. 1 of the drawing, in which position it is out of engagement with its seat so as topermit communication between the chamber |86 and the chamber |18. Y

In addition, on this movement ofthe stemZI) the rockerrarm 234 will-be turned so as tomove the arm 242 towards the valve 88,V while the end 254 of the arm 252 ofthe rocker-arm 25I|-wi1l be moved towards the valve 220. 1 Y i If for'any reason the pressure of the fluid in the chamber 32 increases more rapidly than the flowY past the ball check valve |34 to the chamber |32, and will move the spill-over check valve |26 away from the seat rib |30 against-the spring |28. This uid will then flow to thechamberV |24 and therefrom by way of the passage and Y Vpipe I 36 to the emergency reservoir 4,* thereby reducing the pressureof the fiuid'in the Schamgagement with Athe seat rib '|30' by the spring |28, thereby. cutting off the iiow of fluid from the chamber 32 to the emergency reservoir 4 and, Y. 'preventing back'o'w of'fluid from the emervgencvzyA reservoirV 4 to the chamber A32'. i lIn `addition,on the supply of fluid vunder pressure, to Vthetbralre pipe in ,initially charging the equipment,vthe service portion-ofthe brake controllingvalve device ,5 operates as described in rdetail in the above identified patent to open a communication through which uid under pressuremaybe supplied 'from thebrake pipey I to the auxiliary reservoir 3 and thev emergency reservoir 4. l" j Ona reduction in the pressure of the fluid in the' brake pipe ata service rate to effect a serviceapplication of the brakes there will be a gradual reduction in the pressure, of the fluid in the chamberkZIi -on the face of 'the diaphragm I2.

There will 'bea corresponding reduction in the forceexerted :on the diaphragm |2by the i iiuid under pressure the chamber'26 and the fluid under pressure 'in thechamber' 32 on the oppo- 'site side of the: diaphragm I2, assisted by the springs 'I4 and |85, will exert a greater force on this 'diaphragm than is exerted by the fluid under pressure in the'chamber 26. As a result the diain Fig. 1 of the drawing, thereby moving the stem 281:0 thelright.` n 'l Y VOn this ^movement of the stem 20 the seat on the stem 20 will prem against the valve 48 of the valve device 24 and will move the valve device 24 tothe right as viewed in Fig. 1 of the drawing, thereby'permitting the valve 'I2 of the poppet valve device 60 to be moved away from its seat by :the spring' 14. i

On this movement of the stem 20 the 'arm 252 .of-therocker' arm 250 is vmoved in a 'counterclockwise.` direction, asviewed in Fig. 1 rof the drawingthereby permitting the valvev |84 to be 20,and therefrom through the passages 66 to the chamber 62 on the face of the valve device 24, and thence pastf'the unseated valveA I2 to the chamber 64 from which it-may flow to the atmosphere through the restricted passage 68.

The restricted'fpassage'GB is proportioned so that the rate -of=ow of fluid through this passage is such that it permits the pressure of the fluid in the valve chamber 32 and the quick action chamber'38to be reduced substantially as rapidly as rthe pressurefofthe fluid in the brake pipe and in thechamber 26 isv reduced during a rel duction inbrake pipe pressure ata servicerate. pressure ofthe uid in the.emergency-reservoir, Y v4 fluid lunder pressure from thejchamber 32 Will- After afeertainV amount' ofmovementfof the diaphragm |2 to the right, as viewed in Fig. 1 of the drawing, the rocker arm 234 is turned in a vcounterclockwise direction-an amount suiiicient kto cause 'the arm`2'42V vto engage the end of the bythe spring-98 operating through the poppet valve' 88.

phragm I2` will be moved to theright, as viewed The valve 18 of the poppet valve, device 60 is arranged so that on movement of the armv 242 of the rockerlarm 234 into engagement with the end of the stem'of'the valve 88'it will be located adjacent to, but' out of engagement with its seat so as to permit fluid under'pressure to continue to flow from the chamber 32 tothe chamberk64 and thence to the atmosphere.

l If for any reason, the rate at which the pres-Y vsure of the fluid in the brake pipeY I is reduced momentarily exceeds the normalA service `rate of reduction in brake pipe pressure so that the pressure of the uid in the chamber 28 is re- 'duced more. rapidly than the pressure of the fluid in the chambers 32` and 38 is reduced by operationof the poppet valve device .60, the force exerted onthe diaphragm I2 by the fluid under pressure in the rchamber V32 will' exceed theforce exerted on this diaphragm by the fluid' under pressure in the chamber 26.

Ther fluid under pressure in the chamber'32,Y

therefore, will tend to move the diaphragm I2 to Vthe right, as viewed in Fig. 1 of the drawing, so

Y poppet valve 88V and the arm242 of the rocker arm `234. The arm 242 engages the end of the stem of the *valve 88 before the valve 10 of the poppet .valve device60 is moved to the seated position, and the spring 90' will prevent ,movement of the diaphragm I2 to a position 'to per-v mit'the valve 10 of the poppet valve device 60' to be moved to the seated position'by the vspring 14 to cut offl the release of fluid from the chamber 32 until a'substantial Vdifferential is created Vbetween the pressures in the chamber 26 andthe chamber 32. v

The diaphragm. I2, therefore, will not'fmove'to the position to'permit vthe poppet valve device 60 to cut off the release of uid under pressure from ,the chamber 32 vin response to a momentary reduction in the pressure of ,the fluid in the brake pipe ata rate exceeding the service rate. Y

On a reduction in the pressure of the -luidin the brake pipe at a service rate,.the service portion (not shown) of the brake controlling valve device operates in a manner described in de# tail in the above identified patent to cut off the communication through which fluid is, supplied the chamber |44 of the inshot valve device |40.

Fluid underpressuresupplied to the chamber Y|41 flows therefrom' past thejseat rib |46 and through the passagel|52 tothe .chamber |50,

' from whichrit flows tol the chamber |64 within the seat rib |62 kon the faceiofvthe. inshot valve Y piston |58, andby way of the passage and pipe elfect a Vservice application of the brakes.y

Fluid under Vpressure Vsupplied bythe service portion of the valve device 5 to ther passage |56 also.` ows therefrom throughl the passage |88 to y the chamberv |86. Fluid under pressure supplied to the chamber |86 flows therefrom through the u passage in which theflutedfstem-of the valve |84V is, located and pastthe valve |84, which at this` time isheld away from itsV seat by the endv 254 of the arm 252 of the rocker armr250, to the chamber |18 from which" it flows by way ,of the passage |14 tothe chamber |12 on the spring side of the inshot valve piston |58, and through the -groove |82 to theV area outwardly of the seat ribl |62 on the Vopposite face of the inshot valve piston |58'. Y f Y Y f The pressures in the chambers onthe oppositeV sides of the inshotv valverpiston |58 will, therefore, be substantially equal and the inshot valve piston |58 will thus be held in engagement with the seat ribl |62 yby thenspring |80, and will hold the valve |42 away from the'seat rib |46 so as to permit fluid kunder pressure to ilow at a rapid rate from the passage'l56 and the'chamber |44throughthe passage |52 to the brake cylinder. AThe service portion of Vthe brake controlling valve device willoperate in the manner described in detailV in the above identified patent to supply fluid under pressure to the 'brake cylinder 2 until the pressure of the fluid in the auxiliary reservoir Sis reduced substantially to the pressure to which the fluid in the brake pipe has been reduced. Fluid unde-r pressure supplied from the chamber |18 to the passage |14 also kilows tothe inshot Vpiston volume |16A and therefrom by Way of the passage 208, to theaccelerated release check valves 2I8 and 2I0., The accelerated release check valve 2 I0 is heldin engagement with the seat rib 2|4 by the springy 2|2 and byA the pressure of the fluid inthe chamber |20, which is connected to the brake pipe |by way of the passage |22, the passage 28 and the branchipipe 30.-' During normal service applications of the brakes the pressure of the uid in the brakev pipe I willexceed the pressure of the fluid in the brake cylinderl 2, and hence the fluid under pressure supplied to the passage 208 will be unable to move the accelerated release check valve 2|0 away 'from the seat rib2|4 against the opposing forces of the fluid under pressure in the chamber |20 and the spring 2 I2.

- `Fluid. under pressure supplied by the service portion Vof. the valvedevice to the passage |56 and the passage |88 also flows byy Wayv of thepassage 202 to thefarea on the face of the diaphragm |92 'of the timing valve device I9 within the seat rib 208,'while the fluid under'pressure supplied tothe passage |69 from the inshot valve device |40 flows through the chokeVv 204 to the area on the face of the diaphragm |92 outwardly of the -seatrib 208. Y The diaphragm" |92 Will beheld byV lGhe fluid underpressure inv the chamber |94 in a position in` which the sealin-g gasket 98y engages the seat rib 200', however, Yso that ordinarily during service applications Aof the brakes there will'be no communication between the areason the opposite sides o-f the seat rib 200. Y' Y If after the pressure of the fluid in the brake pipe I has been reduced to the desired extent, thel engineers brake valve is turned tothe lap position to cut olf the Vfurther ventingof fluid from the brake pipe and to maintainV the pressure of the fluid in this pipe, the emergency Valve device provided by this invention vwill operate as described in detail above to'release uidxunder pressure from the chamber 32 and the quick ac tion Achamber 38 until the `pressure of the fluidin these chambersV is reduced substantially to the pressure in the chamber 26. Y' lWhen the pressure of theV iluid inthe cham- -ber'32 and the chamber 38 hasr been reduced to the pressure of `theud in the chamber 26, or

,viewed in Fig. l of the drawing,-tothe innerV awaeisv slightly below the pressure in the chambery 26, the diaphragm l2 is returned to the normal release position, and the stem 20 is moved so as tomove the poppet valve device 6U so that thefvalve 12 thereof lengages its seat t0 cut off the release o fluidfrom the chamber. 32.

On a subsequent increase in the pressure of the` fluid in thev brake pipe I.V to effect the release of the brakes, the service portion of the brake'con` trolling valve device 5 operates in the manner described in detail in the above identified patent to release fluid under pressure from the brake cylinder 2, and to open a communication through which fluid under pressure :will be supplied from the brake pipe to the auxiliary reservoir 3.

On this increase in the pressure of the fluid inthe brake pipe I, there4 will be a corresponding increase in the' pressure of the fluid ir! the chamber 26 on theface of the diaphragm I2.

By this increase in the pressure. of the fluid in the chamber k26, the force exerted fby the` fluid under pressure in this chamber be insure yin the chamber l32 acting on the opposite face of the diaphragm, Yandthe diaphragmv l2 and the stem 20 will bemoved `to the left, as

release position, while the valve devicev 24 will be moved so as to move the valve 12 of the poppet valve device 60 to the seated positionto cut off the release of uid under vpressure from. the chamber 32, if the valve 12 is not already in this position.

On further movement of theL stem 26 subse-VV quent to engagement of the valve 12 with its seat,

the spring 56 will be'compressed and the seat on the stem 20 will be movediaway from' the valve 48, thereby opening communication be tween .the chamber 40 andthe chamber k32A through the passages 58, and fluid under pressure supplied from the brake pipe I to the chamber 26 may flow therefrom at a restricted `rate through the restricted passage k44 to the chamber 46, and then to the chamber 32'to Vincreasethe pressure of the fluid in thischamber-and in the quick action chamber 38.

On thismovement of thefstem-2|| theV rocker` arm 234 is moved in a clockwise direction, as viewed in Fig. 1 of the drawing, while the end 254 of the arm 252 of the rocker armV 250 presses against the end of the stem of the poppetvalve |84 and moves it farther away from `its seat against the spring |85 associated therewith.

After a time interval the pressure ,of the fluid in the chamber 32, and in the quick action chamber 38, will be increased by the f'lowof fluid thereto from the chamber 26 rth-roughrthe restricted passage 44 andthe passages 56 to substantially the pressure of the fluid in the cham?Y diaphragm ber 26 on the opposite face of the l2.

When the pressure of the fluid'in the chamber 32 has increased substantially to this value, the

stem 20 and the diaphragmf|2 `will be moved from the inner release position'V bythe spring 56 assisted by the springs 14 and |85 toa position, in which the seat on the/stem 20 engages thev valve 48 so` as to out off the vflow of fluid from the chamber 48 to the chamberv 32, thereby cutf tingv off the increase in the pressure 'of the fluid the drawing.

"diaphragm I2.

l 7 ment with the valve 48 the spring-56 is no longer eifectiveto urge thediaphragm |2 and the stem 20 to move to the rightfas viewed in Fig. 1 of On this movement of the stem 20, the rocker arm 234'is moved in a counterclockwise direction, as viewed in Fig. 1 of the drawing, while the arm 252 of the rocker arm'250 is also moved.

rment permitted the valve 84 is insufficient to permit the valve |84 to be moved to the seated position. Y

On an increase in the pressure of the fluid in the chamber 32 fluid will flow therefrom through theV passages 54 tothe chamber 52 Within the stemd 28', and therefrom through the passages 66 through the valve device 24 to the chamber 62, from which it will flow by way of the passage |96 to the chamber |94 on the face of the diaphragm |92 of the timing valve device |90 to increase the pressure of the fluid in this chamber tothe pressure presentin the chamber 32.

the passage |56 by way of they passage |14, theV chamber |18, through the passagecontrolled by the poppet valve |84 to the chamber |86, and

then byr way 4of the passage |88 to the passage |56 leading to the service portion controlling valve device'.` p

L On a reduction in the pressure of the fluid in the brake pipe at an emergency rate, the service portion of the brake controlling valve de vlce 5 operates in the manner described in detail in the above identified patent to supply fluid un-v On this rapid reduction in the pressure of the fluid in the chamber 26 the fluid under pressure inV the chamber 32 on the opposite face of the diaphragm |2 assisted by the springs 14 and |85 will cause the diaphragm |2 to moveto the right, as viewed in Fig. 1 of the drawing, there# by moving the stem 20 to the right.Y At this time the seat on the stem 20 is engaged by the valve 48l associated with the valve device 24, and on this movement ofthe stem 20 the valve device r24 is movedV so as to permit the valve 12 of the poppet valve device to be moved away from its seat by the spring 14 and thereby release fluid underpressure from the chamber 32 by inthe chamber 26 is reduced on a reduction inthepressure of the fluid in the brake pipeat an emergency rate.- f

As a result,V therefore, the differential of pres- ,sures between the pressure of the fluid yin they Vchamber 32 and in the chamber 26 on opposite sides of thediaphragm |2 will increase, and the force exerted by the fluid under pressure in the chamber 32 on the diaphragm |2, together with of the brakev V the foree exerted by thefsprings 14 and |85, wiil exceed lthe forceexerted bythe 'fluid under presi sure in the chamber'ZB by an amount sucient to overcome the force exerted Y by the spring 9|) through the valve 88 rand' opposing Ynfiovernent of the stem`2'll and *.thediaphrag'rm I2-bythe uid under pressure in the chamber-7,32.

Thevalve 82 will, therefore, bemoved by the arm 242 of theYV rocker arm 234against the-spring Qfawiay fronr its seat and fluidunder pressure may'thereuponflow from the chamber 32 to t'ne chamber 86, and thence by way of the ypassage 34 tothe chamber `82 on the face of the vent Valverpiston 8|). i i

"The poppet Valve device iian'd the Vother portions of the emergencffy valvegdevice provided by this invention are arranged and proportioned so that thevalve'l of the poppet valve device `till will not be movediinto engagement with its seat until after a limited amount of movement of the stem 25 beyond theV point at which .the arm 242 of the rocker arm'2`34 engages the end of the stem of the valve 88.Y The poppet valvedevice B0, therefore, will not be operated cut off the release of fluid under'pressure from chamber 32 until the valve 88 is openedv to supplyv fluid under pressure tothelehamber'BZ on the face' of thevent valve piston, but it'will loe operated to cut on" the release of fluid under pressure from the chamber l"32`immediately after the valve 88 is opened.

On further movement of the' stem 2|! ,tothef 60, so that the spring 14 does not exert any force on'the stern 20. Y

*The varius parts of '-the emergency valve device provided by this invention are also arranged and proportioned so thatthe poppet valve |34 is held out of engagement with its seat until after the arm 242 of the rockerarm 23 engages the end of the stem of ther-valige VSil. 'Ihe valve |84 is moved tov the seated pesition bythe spring |85 upona limitedYY amount of movement of the stem 26 beyond thepo-int at which the arm242 of therockerf arm 234 engages theendVV of the stem ofthe valve'88 so that the valve |84 permits fluid under pressure supplied to the brake cylinder 2 toi'fiovv to the chamber |12 on the-springside of the inshot valve pistony |58 until'the diaphragm I2 and the stem 20 have moved beyond the zone in which their movement-is not opposed by the spring 9U associated with the valve 88.

This insures 'that fluid under pressure will be Y supplied to the spring side of the inshot Valve 'piston |58 Yduring service applications of the brakesfso as to prevent operationof inshotvalve mechanism to limit the rate of flow of iuid to the brake cylinder.l 't

This arrangement alse insures that the'valve |84 will be moved to the seated Yposition Yto cut off the supply of iiuid under pressure to the spring side of the inshc*J valve pistonll cnmovement ofthe diaphragm l2 and the stem 2% to aposition toV effectfan emergency application ofthe brakes'Y so that theinshot valve mechanisnrvvill pperata-f as vWill *hereafter* morevcfully appear, to limit therate of now of fluid to the brake cylinder.

e' On lmovement of the valve V88 against :the

springv 8|] away "from its seat, fluid under p res-v area-,915

to the chamber 82'fsubstantially'exoeeds rthe rate y at which fluid under pressure may new frcmfthe chamber 82 through the re'jstrictedrpassage 96 through the piston Y3l), and through the groove '9,4 aro-und the piston, and as a result there will be a rapid increase in the pressure of the nuid in the chamber 82. Y

Qn this increase in the pressure of the in the:V chamber y82 the force exerted by the fluid under pressurein this chamber exceeds the opposing force of the'spring H4 and'j'of the fluid under pressure in the chamber |63 operating through the valve |06 and;Y opposing movement of the vent valve piston 8i). i i

As a result'of this increase in the pressure of the'fluid in the chamber B2'the vent valve piston 30 willbe moved tothe right, as viewed in iig. 1 off'the drawing, so that the face thereof engages rib Hill!V on the gasket 98 to cut oi ther flow of nuid around the periphery of V4the piston to the passage 92 leading to the atmosphere.

, On this movement of the vent valve piston S9 the vent' valve Ille` is moved'against the spring i M so that the sealing gasket H9 is moved away from"theseat ribl |2,' thereby permitting iiuid under pressure in the chamber |08 to escape toV the atmosphere past the seat rib l l 2 and through the passage 92. l

Fluid under pressure vis supplied to the chamber |98 vfrom the brake pipe through the branch pipe', the passages 28 and l 22 in Ythe pipe bracket section l, the chamber |20 and the passage li Y 't i f On movement ef the vent valve |06 away from the seat rib I2, therefore, fluid under pressure is vented from the brake pipe l. at a rapid rate and therel'will be'arapid reduction inthe pressure of 'fluid in the brake pipe l, and alse in the chamber 25 on the face of the diaphragm I2.V As a result of VtheV rapid reduction in the pressure of' the'fluid inthe chamber V2li there will be a corresponding*decreaseY in the force exerted by this'fiuid onthe diaphragm I2 in opposition to the force exerted on this' diaphragm by the fluid under pressure inV thechamber 32. AThere will,

f therefore, be a rapid increase in the force exerted on ,the diaphragm l2 and tending to move it to rthe'righa'as viewed'in Fig. 1 of the drawing, and

it will inove in this direction Vvery rapidly. TheV diaphragm l2 may continue 'to nfove in this direction until itsmovement''is limited by engagement ofthe member 42 with the pipe brackety section'l.- v *y On this movementsof the diaphragm' l2 the stern 22 is moved so as to move the rocker arm 234 inra counterclockwisedirection, as viewed Fig. 1 of the drawing,sthereby pressingY2 the arm 242 against the end of the stem of the'valve 8B and moving this Valve farther away from its seat against the spring 90. "1 Y In addition, on this movement of the stem 26, the end 254 offthe arm 252 of the rocker arm 25|) will be moved in a counter-clockwise direction,

from its seat against the spring 224., Y Thervarious parts of theemergencyfvalve de- Y* vice pro-vidediby this/invention are arranged and' proportioned so that the end `'254 of the amir252 of the rocker' arm 25.i will not engage the valve 220 until after the arm 24'2fof-the rocker arm 234, has engaged theendrof the stem of the valve 88 and moved this valve away from its seat so as tosupply fluid underl pressure from the chagri-Y ber 32 to the chamber 82 on the face Vef thervent l reservoir 4 supplied by way of the pipe; and passage |36 to the chamber 222 will flow past the valve 220 to the chamber |86, from which it flows by way of the passage |88 to the passage |56 leading into the chamber |44 of the inshot =va1ve device |40.

In addition, the fluid under pressure supplied to the chamber |86, will flow therefrom by way of the passage 202 to the arearwithinthe seat rib 200 on the face of the sealing `gasket |98 of the timing valve device |90. On the initial supply of fluid under-pressure to the areawithin the seat rib 200 the sealingV gasket |98will be held in engagement with the seat rib 200 as'the pressure of the fluid in the chamber |94 on the opposite face of the diaphragm |92 will be at a relatively high value and will exert a relativelygreat amount of force tending to hold the sealing gasket in engagement with the seat rib 200.

On the supply of uidiunder pressure from the auxiliary reservoir 3 and the emergency reservoir 4to the chamber |44 of the inshot valve device |40 fluid will flow past the unseated valve 42 to the'passage |52 and tothe chamber |50. Fluid under pressure supplied to the chamber 50 will flow therefrom to the chamber |64 on the face of the piston y|58 and by way. of the passage and pipe |69 to the brakecylinder 2.

When the pressure'of the uid in the brake cylinder Zhas increased to a predetermined value the force exerted by the fluid under pressure in the chamber |64 on the piston |58, together with the force exerted by the spring |48 acting through i the valve |42, will be sufiicient toovercome the opposing force of the spring |80, and .the piston |58 will be moved to the left, as viewedin Fig. 1 of the drawing, vagainst the spring |80, so that the seat ribv |66 on the piston |58 engages the sealing gasket |68 to prevent the flow of fluid from the chamber |64 to the chamber |12 ron the spring side of the piston |58.

On this movement of thepiston' |58 Athe Vstem is moved to a position toA permit v.the valve |42 to be movedr by the spring |48 .into the engagement with the seat ribV |46, thereby'cuttlng off the flow of lluid from the chamber |44 through the passage |52 to the chamber |50 and thenceto the brake cylinder.

On movement of the valve |42 to theseated position fluid under pressure continues to flow from the chamber |44athrough the lrestricted passage |54 to the chamber |50 at a restricted rate. The pressure of the fluid in the brake icyl' inder 2 will thereafter be increased at a slower rate than occurred on the'initial supply of fluid under pressure to the brake cylinder.

lThe fluid under pressure whichis supplied toy the chamber B2 on the face of the vent valve piston 80 escapes therefrom through the restricted passage 96 to the passage 92 which communicates with the atmosphere. gradual release ofY fluid under pressure through the passage 96 there will be agradual reduction in the pressure of the fluid'inv the chamber 32,

in the quick action chamber 38 and in the chamber 82. v

The passage 96 is proportioned,v however, soY

that the rate of flow'oflluid through this pas- As a'result of the` sage is such that the vent valve |06 will be held away from the seat rib 2 against spring ||4 for a period of time long enough to permit the pressureof the lluid in the brake pipe to be reduced substantially to atmospheric pressure.

When the vpressure of the fluid in the chamber 82 on the face of the vent valve piston 80, and in the chamber 32 and the quick action chamber 30, has been reduced to a predetermined relatively low value, the spring ||4will move the vent valve |06 to theleft, as viewed in Fig. 1 in ythe drawing, so that'the sealing gasket 0 again engages the seat rib 2 to cut off communi- 'cation between the chamber |08 `and the atmosphere passage 92.

On this movement of the vent valve |06 the piston 80 is moved away from therib |00 on the gasket 98 and is returned to the position in which the groove 94 establishes communication around the piston 80 so that any fluid under pressureremaining in the chamber 82 may escape therefrom at a rapid rate through the groove 94 to the chamber on the opposite face of the piston and thence to the atmosphere by way of Athe passage 92.

As the kpressure of the fluid in the. chamber 32 is reduced there will be a corresponding reduction in the pressure of the fluid in the chamber |94 on the face ofv the diaphragm |92 ofthe timing valve device |90, and a corresponding reduction in the force exerted by this fluid under pressure on the diaphragm |92 and tending to maintain the sealing gasket |98 in engagement with the seat rib 200.

' At the same time,V as a result of the gradual increase in the pressure of the fluid in the brake cylinder 2, there will be a gradual increase in the pressure of the fluid in the chambers on the opposite face of the diaphragm |92 'and the force exerted by the constantly increasing pressure -in these chamberswill eventually overcome the opposing force of the fluid in the chamber |94 which is constantly decreasing in pressure.

When this occurs the diaphragm |92 will be moved so as to move the sealing gasket |98 away from theY seat rib 200 so that thereafter fluid under pressure supplied to the passage |56 from the auxiliary reservoir 3, and from the emergency reservoir 4 to the chamber |86 and thence to the'passage 202, can llow past the seat rib x 200, and through the choke or restricted passage 204 to the passage |69 leading to the brake cylinder. This will result in an increased rate of ow of fluidto the brake cylinder, and fluid under pressure will continue to flow to the brake cylinder from the auxiliary reservoir 3 and the emergency reservoir 4 until the pressures in these reservoirs and in the brake cylinder equalize.

When the pressure of the fluid in the chamber 32 has been reduced to a very low value by the venting of fluid under pressure therefrom through the restricted passage 96 through the vent valve piston 80 or through the groove 94 around the vent valve piston 80, the force exerted by the fluid under pressure in the chamber 32 on the diaphragm I2 is insulcient to hold the diaphragm against the opposing force of thespring 90 acting through the valve 88 and the arm 242 of the rocker arm 234, and the spring 224 acting through the valve 220 and the arm 252 of the rocker arm 250.. 'As a result the springs 90 and 224 will move the valves 88 and 220, respectively, towards their seats, thereby causing the diaphragm |2 to be moved Y a short distanceto therleft from the application position towards-the normal release position. On-movement of the valvev 220 to the seated position the spring 224 is no longer effective to exert any force on' the arm 252 ori the rocker arm 254, and thereafter the stem 20 is subject only to the force exerted by the spring 951 operating through the poppet valve 88 and the arm 242 of the rocker arm 234,

y'On' movement of the stem 28 and the diaphragm |2 away from emergency application position subsequent to engagement of the valve V220 with its seat, the end 254 of the arm 252 of ber 40 within the stem 20.

the rocker arm 250 engages the end of the stem of the valve |84 which is held in the seated position by' thespring |85 so that further movement of the stem 20'and the diaphragm |2 by the spring 90 operating through the valve 88 is opposed bythe spring |85 operating through the valve |84.` l Y The springs |85 and 90 are proportioned so that the spring 90 is unable to overcome the spring |85, and as a result the valve |84 is held in the seated position by the spring |85, while the valve 88 is held away from its seat byi the arm-242 of theY rocker arm 234. Y

As the valve 88 is held in the operi position any uid under pressure remaining Ain the chamber r32 may escape to the atmosphere through the chamber 86, the passage 84 and the chamber 82 which is open to the atmosphere through the groove 94. u f

As the valve |84 is held in theseated-positionY bythe spring |85, fluid under pressure in the chamber |86, which communicates with the brake cylinder v2 byway of the passages |88 and |56'and the inshot'valve device |48, cannot flow to the chamber |78 from which it could flow by way of YAthe passage'l74 and the inshot piston volume |78l to the passage 208 and past the accelerated release check valves 2i8 and 2 i Yto the brake pipe 'u On a subsequent increase in the pressure of the uid in the brake pipe to Yeffect the release yof the brakes, there will bea correspondingV increase in the pressure of the iiuid in the chamber 26 on the face of the diaphragm I2.r VOn an increase in the pressure of the fluid in the chamber 26, fluid under pressure williiow therefrom through the restricted passage 44 to the cham- The valve'48 of the valve device 24 is in engagementfwith'its seat at this time, however, so that fluid under pressure cannot ow from the chamber 40 through the passages 50 to the chamber 32. Y

On Vanincrease in the pressure of the uid in the chamber 26 on the face of the diaphragm Y l2 this uid exerts a force on the diaphragm l2 tending to move this diaphragm andthe stem 20 to the left, as viewed in Fig. l of the drawing. This movement of the diaphragm |21 and the stem 20 is opposed by the spring |85 operating through the valve |84 and the arm 252 of the rocker arm 250. v

`When the pressure of the fluid in the chamber 26 has increased to a predetermined value the force exerted by this fluid on the diaphragm I2 is sucient to overcome the opposing force of Vthe spring |85,'y and the diaphragm I2 and the stem 20 will be moved away from the emergency application position, while the arm 252 of the rocker armw25 will press against the end of the stem of the valve |84 and move this valve away from its Vseat against the spring |85. In 'addi-V tion on this movement of the diaphragm l2 and Yinte engagement with its seat to cut oif Ycommunication between the chamber 32 and the at'- mosphere by way of passage 68.

After the stem 28 has moved far enough from the' application position towards thenormal or release position to move the valve 72 of the poppet 'valve device 60 into engagement with its seat further movement of the valve device 24 isY prevented, whilemovement of the stem 28 relative to the valve device 24 is opposed by the spring 56. c

On movement of the valve |84 away from its seat the fluid under pressure present in the chamber |86, which communicates with the brake cylinder 2 throughy the timing valve device |90 and the inshot valve device |40, will ow therefrom' to the chamber |78 and thence by way of the passage |74 to the inshot piston volume |78. Fluid under' pressure supplied to the inshot piston volume |76 will iiow therefrom through the passage 208 and past the ball check valve-2l8 to the chamber 2|6 .within the seat rib 2|4, and ona'nv increase in the pressure of the iiuid in the chamber 2|6 to a predetermined Value the accelerated release check valve 2|0 will be moved away from the seat rib 2|4 against the spring 2|2, Vand fluid under pressure will thereupon flow to the chamber |20 and thence by way of the passages |22 and 28 to the chamber 25 on the face of the diaphragm I2, and to the branch pipe 30 leading to the brake pipe Y The pressure of the fluid in the brake cylinder 2 is at a relatively high value' at this time, while the pressure of the fluid in the brake pipe is at arelatively low value sothat the fluid under pressure supplied by way of the passage'Zll to the chamber 2|6 beneath the accelerated release check valve 2|!) Vis able'to move this-valve away from its seat against the spring 2|2,-and fluid under. pressureV will be supplied from the brake cylinder 2 to the brake pipe to'increase the pressure of the fluid in the brake pipe, and in the chamber 26 on the face of the diaphragm l2, so that a local increase in brake pipe pressure is effected, which accelerates the release action throughout the train.

In addition, the auxiliary reservoir 3 is in communication with the brake cylinder 2 at this time through a'port in the service portion of the brake controlling valve device 5 so that fluid under pressure will flow from the auxiliary reservoir 3, as Well as from the brake cylinder 2, to the brake pipe When the pressure of the' fluid inthe brake cylinder 2 and the auxiliary reservoir 3 and in `the brakepipe have substantially equalized by the flow of iiuid under pressure from the brake cylinder and the'auxiliary reservoir to the brake pipe, the'accelerated release check valve 2|!) is moved'intorengagement with the seat rib 2|4A by the spring 2| 2 so as to cut oif the further flow of fluid under pressure from the brake cylthe chamber 64l and the brake pipe to the brake cylinder and tothe aux` iliary reservoir.

Fluid under pressureisupplied tol the chamber |18 also flows therefrom through the passage |14 to the chamber |'|2 on the spring side of theV piston |58 .of the ginshot valve device |48',' Y

and when the pressure of the fluid'fin this chamber has increased to a predetermined value the inshot valve' piston V|58 will be moved by thek spring |88 away from the sealing gasket |68 and into engagement withthe seat rib |62; On this movement of the-piston. |58 the stem |10 moves the Valve |42 away from the seat rib |46 againstthe spring |48.

As the pressure of the fluid in the chamber* 26" builds up `the diaphragm |2 and' the stem 20l will be moved to the left,vas viewed in Fig. 1 of the drawing, relative'to the valve device 24to the inner release position and the'` spring 56 will be compressed, While the seat on the stem 28 will be moved away from the valve 48`as'so'ciat'ed with the valve device 24 so that fluid under pressure supplied from the brake pipe to Vthe chamber 48 may flow therefrom to the chamber 32 and from this chamber through thepassage 36' to the quick action chamber 38. j

Fluid under pressure will be supplied to the chamber 32 and tothe quick action chamber 38 from the chamber 26 only at a restricted rate because of the restricted flow capacity, of the Apassage 44 through which fluid under pressure substantially to the pressure of the fluid in theV chamber 26 and the stem 2|) will thereupon be moved bythe spring 56, assisted by the spring |85, from the inner release position to the normal release position so that the seat on the stem 2|) engages the valve 48 associated with the valve device 24 to cut off the iiow of uid from theY chamber 48 to the chamber 32 action chamber'38. 1

On this movement of the stem- 20the rocker arm 234 will be movedin a counterclockwise di'- and to the quick rection a small distance, but it will notbernoved.

far enough so that the. arm 242 on'the rocker arm 234 will engage the endl of the stem of the poppet valve 88 and move Athis valve away from: its seat against the spring 98.

In addition, on this movement ofthe stem 28 the arm 252 on the rocker arm 250 will Yalso be moved a short distance in a vcounterclockwise direction, thereby permitting thevalve |84 to be moved towards its seat by the springv |85, butthe amount of movement ofY the arm.- 252 isv in-` sufficient to permit the-valve |84 to be moved toY the seated position. w

If'for any reason the pressure of the fluid in the chamber 32 is increased to a valueex ceeding that in the emergency reservoir 4 by a predetermined amount, as may occur onarapid increase in the pressure of theuid in the'brake pipe, fluid under pressure'from the chamber 32 will flow past the ball check valve |34 to' the chamber |32 within the seat rib |3|J,and it will move the spill-over check'valve |26 awayfrom the seat rib |30 against the spring |28-, so that fluid under pressure may iiow to the chamber ||4 and thence by way of the passage When the pressure of. the :udiiu theYV chamber- 32 hasreducedr substantially to the. pressure in the emergency reservoir 4' the spill-over check valvey |26 will be moved bythe spring |28 into engagement withA the seat rib |30 to cut off the nwV of fluid'` from the chamber 32 to the emergency reservoir 4.

On an. increase. in the pressure of the fluid in the chamber 32 there will be a corresponding increasein the pressure of the uid in the chamberv |94on. theface of the diaphragm |82 of the timing valve device |80., andthe ii'uid under pressureV in this'- chamber operating through the diaphragm |192 will press the sealing gasket |98 against the seat rib 266'.

When the pressure.r of the fluid in the brake pipe'l haslvbeen` increased to a predetermined value so asto exceed' the pressure of the iiuid in theauxiliary vreservoir 3, the service portion ofthe brake controlling valve device operates as dascribediinj detail in the above identifled'patent torelease'filuidi under pressure from the brake cylinder, 2, and to open la communication through which fluid under pressure'may be Vsupplied from thebrake pipe to the auxiliary reservoir 3 to charge thisv reservoirV under pressure, and through which fluidiunder'pressure may alsobe supplied to the emergency reservoir 4.

While one embodiment of theV brake controllingY valve-device provided. by this invention has been illustrated and described indetail, it should befSunderstOod that the invention isV notA limited toV4 these details of construction, and numerous changes and modifications may be made without departing from the' scope' of the following claims.

Havingffnow described my invention, what I claim asfnewand desire to secure by Letters Patent,;is:

w1; vInaiiuid pressure brake equipment, in combii'iatiorn'af,brakeV pipe,. and an' emergency valve device comprising a movable abutment subject tostlieopposing pressures of the iluid in the brake pipe and-1 of the fluid in. ar pressure chamber, a poppet valve controlledV byA said' abutment and controlling a passage through which fluid under pressure may be supplied from the brake pipe tothe pressure chamber, and yielding resistance rnejans`- opposing movement of the abutment to effect operation4v ofv said poppet valve to open communication through the passage controlled thereby.

2; Ina fluid'pressure brake equipment, in co-mbination, a brake pipe, and an emergency valve device' comprisingY a movable abutment subject to'theopposing vpressures of the fluid in the brake pipe ancly of' the fluid' in a pressure chamber, a poppet valve operated by said abutment and controlling a passagethroughY which said pressure chamber may be supplied with uid under pressure from the brake pipe, and a poppet valve device controlled by said abutment and controlling: al passagev through which fluid under pressure maybe released from the pressure chamber.

' 3. Ina fluidpressure'brake equipment, in combination, abrake pipe, and an emergency valve device comprising a movable' abutment subject tofthe opposing pressures ofthe fluid in the brake pipev and of the fluid in a pressure chamber, a poppet valve operated by said abutment and controlling a passage communicating with the brake pipe and the pressure chamber, and a poppet valve device controlled by said abutment and controlling a passage through which fluid under pressure may be released from the pressure 'chamber atf a restricted rate.

4.,. In a1fl'uid pressurebrake equipment, in combnation, a brake pipe, andan emergency valve device comprising' a movable `abutment 'subject to ythe opposing Ypressures of: the'iiuid Lin the brake pipe and of the fluid in. a pressurecham`` ber, a poppet valve operated by said 'abi'ltment controlling a passage communicating With Y the Ybrake pipe and the pressuref chamber, and a poppet valve devicelcontrolled by the abutment through said poppet valve and contro-llinga passage through `vvhiclrfluid under 'pressure may be released from thepressure chamber.-

5, Inra fluid pressure brake equipment, in com--V bination, a brake pipe, and an emergency valve comprising a movable abutment; subjectl to the opposing pressures of the'fluid in the brekepipe and of the fluid in vva pressure chambena' valve device associated `vvith saidiabutrment, the valve devicelbeing :movable with the abutment andV being'movable relativer thereto, the valveV device comprising'a ppppetvvalve operated on movement of the abutment relative to the valve device to open: a'passage communicating with the brake pipe arid the pressure chamber, and a popp valve operated on movement of the valve device vvith the abutment to open' a passagejthroughv which iiuidimay be released'from the'pressure chamber. 'i

6. In a fluid 'pressurerbrake equipment, in combination, a brake pipe,"'and an emergency valve comprisingr Va movable Vabutment vsubject v'to 'the opposing pressures ofthe 'fluid in thebrake 'pipe' and oflr'the fluid in a pressure chamber, a valve deviceassociated with saidabutmenujthe valve device Ybeing movable with the abutment 'and being movablel'relativethereto, the-valve device comprising a poppet'valve operated on. movement of the abutment relative to the valve devicetd device associated with the abutment, the valve device being movable With-the abutment and being movable relative to the abutment, the valve deviceY comprising a poppet valve perated by movement of the abutment relative to the valveV device to opena passage communicating with the brake pipe and Withthef pressure chamber, andr poppet valve means eperated on initial movement of the valve device Vby the abutment toppen a passage through which liuid may be released froml thefpressure chamber and operated onffurther mote-ement of the valve device by the Yabutment to cut ofcommunication through saidpassage.Y

8.` In a fluid .pressure brake equipment, in com# binatio-n, a brake pipe, andfY an emergency valve comprising amovable abutment subjecttothe opposing pressures of the 'uidz in the brake Ypipe and of the fluid in a pressure chamber, and a Valve device associated with the abutment; the

valve deviceY being movable With the abutment and being movable relative to the abutment, the valve device -comprisingfa poppet valve'f operated by movement of the abutment relative to. the valve device to open a passage communicating with the.

brake pipe and With the pressure chamber, poppet valve means "operated 'on initial movement ofthe valve device bythe abutment to open a passage` through'whichY fluid may` be released @from the pressure chamber and operated on further movement of the valveV device. by the abutment to cut 'oft communication through said passage, and

yielding resistance means opposing relative movement between the abutment and the valve device.

:9. In a'fluidrpressure brake equipment, incombination, abra-ke pipe, a brake cylinder, a rese-rvoir,Y afvent valve vdevice operated uponthe supply of iiuid under pressure thereto to vent fluid from the brake pipe, a movable abutment subj ect to the opposing pressures of the fluid in the brake pipe andof the uid in a pressure chamber, a poppet valveloperatedby' said abutment and controlling -a Ypassage through VWhich fluid under pressure maybe supplied to the vent valve device, Yand a moppetvalve'operated by said abutment and controlling a'communicatio'n through which fluid under pressure is'supplied from the reservoir to the brake cylinder. i

10. In a fluid pressure brake" equipment, in combination, a brake pipe, brake cylinder, a reservoir, a vent valve device. operatedV on the supply of fluid under pressure theretoftovent uid from' the brake pipe, amovable abutment subjectfto the opposing pressures of the fluid in the brake-pipe and of the fluid Yin a pressure'chamber,V a poppet Vvalve operated by said abutment Y fluid underv pressure thereto to ventfluid from the brake pipe, amovable. abutment Vsubject to thev opposing pressures of the fluid in they brake pipe and of Y'the fluid in a Ypressure chamber, the abutment having normalY position and being movable therefrom in response to changes in the pressures Tcl-f" lthe fluid operating thereon, a`poppet valvecon l,olling a passage through vwhich fluid may be supplied to` the vent valve,vv said poppet valve fbeing operated lto open communication i through the passagecon movement of the Vabutment a given distanceV from the normal position; and a poppet valve operated by said abutment and controlling aY passageV communicating with the reservoir andlwith the brake cylinder, said valve being Aoperated to open communication through said passage only after movement of the abutmentfrom the normal'position a distance greater 'than said given distance.

Y"12. In a fluid pressure brake equipment, in

combination, a brake pipe, a reservoir, a brake cylinder, a vent valve oplated on the supply Yof fluidjunder pressure thereto to vent fluid from the brake pipe, movable abutment subject to the opposing pressures of the fluid in'the brakeV pipe and-of fluid inaY pressure chamber, the abutment having a normal position and being movable therefrom in Vresponse to changes in the pressures sage communicating with the reservoir and ywith the'brake cylinder, said valve being operated to open communication through said passage only after movement of the abutment fromthenormal position a distancegreater than said given distance, and yielding resistance means'operating through the first-named poppet valve `and opposing movement of the abutment away from the normal position.

y13. In a fluid pressure brake equipment, in combination, abrake pipe, a reservoir, a brake cylinder, avent valve operated on the supply of iiuid under press-ure thereto tovent fluid from the brake pipe, a movable abutment subject to the opposing pressures of -the fluid in the brake pipe and of the fluid in 'a pressure chamber, the abutment having anormal position and being movable therefrom in response to changes in the pressures of the fluid operating thereon, a poppet valve controlling a passage through whichv fluid may be supplied to the vent valve, said poppet valveV being operated to open`V `communication through said passage on movement of the abutment a given distance from the normal position,

.a `poppet valve operated by said abutment and controlling a passage l communicating with the reservoir and with the brake cylinder, said valve being operated to open communication through said passage only after movement of the abut-V ment from the normal position a distance greater than said given distance, and yielding resistance means opposing movement of the first-named poppet valve to open communication through the passage controlled thereby.

14. In a iiuid pressure brake equipment, in

combination, a brake pipe, a vent valve operated on the supply of iiuid under pressure ythereto to vent fluid from the brake pipe, a movable abutment subject to the opposingY pressures of the uid in the brake pipe and of ther fluid ina pressure chamber, the abutment being movable between a release position and an application' position, a poppetvalve` operated by the abutment on movement from the release position to theapplication position to open communication through a passage through which fluid under pressure may be supplied to the vent valve, and a spring operating through said poppet valve and opposing movement of the abutment to the ap,- plication position.`

15. In a fluid pressure brake equipment, in combination, a brake pipe, a vent valve operated on the supply of fluid under pressure thereto to Vent iiuid under pressure from the brake pipe,` a movable abutment subject to the oppOsing pressures of the fluid in the brake pipe and of the fluid in a pressure chamber, the abutment being movable between a normal position and an application position, valve means operated by said abutment and controlling a passageY through which fluid under pressure may be released from the pressure chamber, the valve meansrbeing conditioned to cut off communication through said passage when the abutment is in the normal position or in the application position and being` through a passage through which fluid under pressure may be suppliedto the vent valve, and a spring operating through said poppet valve and yieldingly opposing further movement. of the abutment after a given amount of movement of the abutment" from theznormal position towards the application position.

16. In a fluid pressure brake equipment, in combination, a brake pipe, a brake cylinder, an emergency reservoir, and an emergency valve device comprising a movable abutment subject to the` opposing pressures of the fluid in the brake pipe and of the fluid in a pressure chamber, an inshot valve device subject to the opposing pressures of the fluid in ,anroperating chamber and of the uid supplied ;to the brake cylinder for regulating therate of s upply of iiuid to the brake cylinder, a poppet valve operated by said abutment and controlling a communication through which uid is supplied to said operating chamber, and a poppet valve operated by said abutment for controlling communication fromthe emergency reservoir to the brake cylinder.'

17. In a iiuid pressure brake equipment, in combination, a brakeY pipe, a brake cylinder, and an .emergency valve device comprising a vent valve operative on the supply of fluid under pressure thereto'to vent fluid from the brake pipe, an inshot valve device subject to the opposing pressures of the uid supplied to the brake cylinder and of the fluid in an operating chamber, a poppet valve controlling the supply of uid to said vent valve, a poppet valve controlling the supply, of fluid to saidoperating chamber, and a movable abutment subject to the opposing pressures of the fluid insthe brake pipe and in a pressure chamber and operative on a sudden reduction in the pressure of the fluid in the brake pipe to first open the poppet'valve controlling the supply of fluidto the `vent valve and to then permit the poppetvalve controlling thesupply of fluid to the operatingchamber of the'inshot valve device to seat. Y

18. Ina fluid pressure brake, in combination, a brake pipe, a brake cylinder, an emergency valve device comprising a movableabutment subject to the opposing. kpressures of the brake pipe and a pressure chamber and valve means operated by said abutment'upon a sudden reduction in brake pipe pressure for effecting an emergency application'of the brakes, an inshot valve device subject to the opposing pressures of the brake cylinderand an operating chamber for regulat-V ing the rate of flow of fluid under pressure to the brake cylinder, valve means operable by said abutment and normally establishing communication from the brake cylinder to a passage which is constantly connected to the brake pipe and to said operating chamber to prevent the operation of said inshot valve device in effecting a service application of the brakes, said valve means being operated to close said communication upon movean emergency valve device comprising amovable abutment subject to the opposing pressures of the fluid in the brake pipe and of the fluid in a pressure chamber, means operated by said abutment for supplying iiuid from the reservoir to the brake cylinder, an inshot valve device sub'- ject to the opposing pressures of the fluid 'supplied to the brake cylinder and of an operating Y fluid supplied to the brake cylinder and of the posingpressures of the uid inthe brake pipe and in an operating chamber, said abutment being movable between a normal position and an application position, means operatedbythe abutment on movement to the application position to Vsupply fluid under pressure vfrom the reservoir to the brake cylinder, an'inshot valve device/'subject to the opposing pressures of the fluid in an operating chamberfor regulating the rate of supply of uid' to the brake cylinder, valve means controlled by said abutment and operative .inl the normal position of the abutmentY tov supply uid under. pressure from the brake Y cylinder to a communication which is constantly connected to the brake pipe andlto said operat- Y an emergency ing chamben'saidvalve means being operative upon 'movement vof the abutment to the application position to cut off the supplyof fluid to said communication, and valve means forpreventing backv flow of fluid from I,the brake pipe to .said communication.

21. In a iluid pressure a brake pipe, a brake cylinder, areservoir, and

' valve Adevice comprising a movable abutment subject to the opposing pressures of the fluidin the brake pipe and of the fluid in a pressure chamber, said abutment lvbeing movable between a normal position and anv application position, a vent valve operative upon an increase Vin iluid pressure to vent fluid from' 'the' brake pipe, means operative on movement of the abutmentto the application position'to supply fluid brake, in combination,

to' saidivent valve and tosupply fluid from the reservoir to the brake cylinder, Ymeans yieldingly opposing movement of the abutment to the application position, an inshot valve device subject to the opposing pressures of the fluid supplied to the brake cylinderjand of the uid in an operating chamber for regulating the rate of supply of fluid to the brake cylinder, means controlled by the abutment and operative .on movement of the abutment to the normal position to supply fluid from the brake cylinder to a communication Whichis constantly connected to the brake pipe and to said operating chamber, said means being operative `on'movement of the abutment to'the operating position to cut off the supply of uid'to said communication, and a check valve forpreventing back flow of uid `from the brake pipe to'said communication.

22. In a fluid pressure brake equipment, in combination, a brake pipe, a brake cylinder, a reservoir, a movable abutment subject to the opposing pressures of the fluid in the brake pipe and of the uid in a pressure chamber, said abutment being-movable between a normal position and anapplication position, means operated .by said abutment on movement' to the applicationposition to supply fluid from the reservoir to the brake cylinder, inshot valve means subject'to the opposing pressures of the fluid supplied to the brake'cylinder and of an Aoperating chamberfor regulating the supply vof fluid to the brake cylinder, means controlled by ysaid abutment and operative in the normal position thereof for supplying fluid Vunder pressure from the brake Vcylinder to a communication which is constantly connected to said operating cham-'- ber and tothe brake pipe, said-means being operative in the application position of the abutment to cut olf the supply ofgfluid to said' communication, a'check valvey for preventing back flow of fluid Vfrom the brake pipe to. said communication, and means yieldingly opposing movement ofthe abutment from the application vposition toward the normal position. d

' BURTON S'AIKMAN. 

